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Convert a char to upper case in Rust

ToUppercase is an iterator, because the uppercase version of the character may be composed of several codepoints, as delnan pointed in the comments. You can convert that to a Vector of characters:

Example of Converting a char to upper case in Rust

fn main() {
    let fi_upper: Vec<_> = 'k'.to_uppercase().collect();
    println!("{:?}", fi_upper); 




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